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प्रश्न
What does the pH of a solution signify? Three solution A, B and C have pH values of 6, 4 and 10 respectively. Which of the solutions is highly acidic?
उत्तर
The pH of a solution signifies whether it is an acid or a base and also its strength. Solutions with a pH greater than 7 are considered basic or alkaline, solutions with a pH less than 7 are acidic, and solutions with a pH of 7 are considered neutral.
Solution B with the lower pH value of 4 is highly acidic.
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संबंधित प्रश्न
Sodium hydroxide turns blue litmus red.
- Both acids and bases change colour of all indicators.
- If an indicator gives a colour change with an acid, it does not give a change with a base.
- If an indicator changes colour with a base, it does not change colour with an acid.
- Change of colour in an acid and a base depends on the type of the indicator.
Which of these statements are correct?
Why does tooth decay start when the pH of mouth is lower than 5.5?
Name the indicator which can give us an idea of how strong or weak an acid or base is.
The pH of soil A is 7.5 while that of soil B is 4.5. Which of the two soils, A or B, should be treated with powdered chalk to adjust its pH and why?
What is the name of the indicator which can be used for testing the pH of a solution?
A beaker of concentrated hydrochloric acid has a pH of 1. What colour will full range universal indicator turn if it is added to this beaker? Is it a strong or a weak acid?
(b) Name the acid or alkalis used to make (i) car batteries (ii) explosives (iii) soaps (iv) fertilisers.
The daffodil plants grow best in a soil having a pH range of 6.0 to 6.5. If the soil in a garden has a pH of 4.5, which substance needs to be added to the soil in order to grow daffodils?
(a) salt
(b) lime
(c) sand
(d) compost
Solution A turns universal indicator blue to purple whereas solution B turns universal indicator orange to red.
What sort of reaction takes place when solution A reacts with solution B?
